#include "reg51.h"

#define LED P0_0
#define ADDR0 P1_0
#define ADDR1 P1_1
#define ADDR2 P1_2
#define ADDR3 P1_3
#define ENLED P1_4


int main() {
    unsigned int i = 0;

    ENLED = 0;
    ADDR3 = 1;
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;

    while (1) {
        LED = 0;
        for (i = 0; i < 30000; ++i);
        LED = 1;
        for (i = 0; i < 30000; ++i);
    }
}